DE1513786A1 - Electric machine with ironless rotor design - Google Patents

Description

INTERELECTRIC SÄCHSELN AG March 18, 19-66

SÄCHSELN OW / SWITZERLAND

Electric machine with ironless rotor design

The invention relates to an electrical machine uit ironless rotor design. Such machines were previously rotationally symmetrical due to their functional founders, in particular cylindrical. In a known motor embodiment (DAS 1 13o o55) is the stator formed cylindrically, coaxially to one as Full-cylinder permanent magnets. The hollow cylindrical stator thus formed the iron return part for the fully cylindrical, diametrically magnetized permanent magnet. When the rotor is designed as ironless, pot-shaped winding results in a particularly high efficiency,

The invention is based on the object of improving this arrangement in the direction of even higher efficiencies and at the same time reduced exposure to the surface to develop. BAD ORIGINAL

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In order to achieve a high output, van strives for the highest possible air gap induction. This requires in turn, a correspondingly strong ice-cream lock. Up to now, the ironless rotor electrical machines have generally been circular Iron backing provided, whereby the minimum dimensions of the machine were determined. For a favorable iron circuit, the iron cross-section should be as large as possible and have as large a diameter as possible. For cheap Installation conditions, on the other hand, should be based on the iron backing be as fine as possible, i.e. have the smallest possible diameter.

The two contradicting one listed above Requirements are according to the invention thereby solved that the stator itself tangential to the rotor cylinder surface has a flat structure, in particular in that the SisenrUckschlussteil to the two Magnetic poles in consideration of opposing locations the magnetic flux ratio lake is flattened.

This measure is based on the knowledge that la Iron back of the magnetic FIuO not houogen

BAD LOCATION.

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is distributed, but a minimum at the points opposite the magnetic poles and at the un 90 ° offset points has a maximum. Wears nan Taking this fact into account, the iron back circuit can be designed to be flattened in relation to the magnetic poles, without impairing the performance or the efficiency of the machine. this means that with the same thickness of the stator greater power or less thickness with the same power is achieved.

According to a further development of the concept of the invention, it is also possible to achieve a flat construction of the electrical machine with the highest possible air gap induction, in that the iron back yoke part is U-shaped and does not grasp the perimeter with its legs. In this case, the U-arms are expediently arched against the rotor so that scattering losses occur. Magnetic gap remain small, although the long sides of the U-shaped Magnotruckechlußteils remain open.

In the drawing are some embodiments of the Electric machine according to the invention shown for example.

BATH ORIGINAL

00982 1/037 /,

Show it:

Fig. 1 is a longitudinal section through an electrical

Machine with iron-free rotor and pot Winding,

Fig. La shows a cross section through the iron back yoke part of the machine shown in Fig. I ₁

Fig. 2 shows a U-shaped iron back yoke part of

Electric machine according to the invention with one arranged between the U-legs cylindrical permanent magnets,

Fig. 3 a U ~ foralgae ElsenrUckschlussteil uit

central mandrel and permanent magnet magnets arranged on the U-legs,

FIG. K shows an arrangement consisting of two separate magnet systems according to FIG. 3.

In Fig. 1, 1 denotes a cyl Inder föruigen Pemanentuagneten, whose poles N and S are shown in Fig. la. With 2 the peranenta magnet is on all sides The closing ElsenrUckschlussteil referred to, the cylindrical Forti of the Peruvian magnet 1 to a large extent

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is adapted. At the points 3 and 3 'of the iron backlash part 2 opposite the poles, however, this is flattened according to the invention, as can be seen from FIG. With this flattening, the iron back yoke is not impaired, as can be seen from the illustration of the magnetic lines of force denoted by uit k. Since the lines of force merge into the magnetic poles N and S of the Percianentuagnet at points 3 and 3 ', no large iron mass is required at these points to produce a magnetic inference.

This design is of particular importance when using an ironless rotor uit a cup-shaped one Winding 5, as shown in Fig. 1 and Fig. La scheciatisch. According to the exemplary embodiment Fig. 1, the rotor winding 5 is nontiert on a shaft 6 and provided with a collector 7, the Collector brushes 8 and 8 'are assigned. Geuäß one particularly appropriate design of the subject matter of the invention the collector brushes assign several independently from each other resilient individual contact elements, in particular contact wires, which are different from one another Have natural frequencies. This ensures even and reliable contact during commutation, what with the high efficiency of the machine

after the invention of great importance. '"' ^!

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For easier production of the flattened iron back yoke part, it is made of technological and For structural reasons, it is expediently built up from individual metal sheets, which is relatively increased A magnetic field standing by iron back-up is not necessary and therefore not obvious.

It is also conceivable to build up the iron backlash from sintered metal.

In Fig. 2 is another exemplary embodiment of the electrical machine according to the invention ait eino U-shaped iron back yoke part shown. Io means a cylindrical Pernanenttiagneten nit Poles N and S, between the legs 11 and 11 * of a U-shaped iron return part 12 centrally is arranged.

The insides of the legs 11 and II ¹ are adapted to the cylindrical Peruvian magnet Io by means of pole-shoe-like curvatures, which ensures a narrow, only slightly scattering magnetic gap for accommodating the ironless rotor, not shown in the drawing. The rotor can be designed as a pot-shaped winding according to the models in the embodiment according to FIG. 1. The collector is expediently also constructed in the same way as described with reference to Fig.l.

009821/03 74 BADORLGiNAL

Fig. 3 shows a discussion of the embodiment according to Fig. 2. The iron backing plate is designated as 13 and is essentially also structured. However, it has between the U-legs 14 and 14 · a central mandrel 15, while the permanent magnetic field is generated by two permanent magnets 17 and 17 *, which are attached to the U-shaped loops 14, for example. 14 ^f dee Elsenrückschlussteils 13 are arranged. The sides facing the mandrel 15 are adapted to the cylindrical shape of the mandrel 15 by means of a corresponding pole shoe-like configuration. The mandrel 15 can also be designed as a cylinder magnet.

The embodiment shown in Fig. 4 corresponds essentially to those shown in Fig. 3 and differs from these anr in that the whole system is designed in two parts, what consists of Manufacturing reasons τοη can be an advantage.

In particular, a special development of the inventive idea Peraanentnagnetteil · 17 and 17 · the arrangement similar to the Flg. 3 and 4 as prisnatic, known per se Single crystal permanent magnets are formed. Such single crystals The shape of the magnet system shown in FIGS. 3 and 4 can be seen particularly well adjust.

ORIGlNAL BATHROOM

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The electrical machine according to the invention can be designed both as a generator and as a motor can basically be operated with alternating current. Of particular importance is of course the application as DC motor, whose flat design is particularly suitable for small devices, especially battery-operated devices the flat design is suitable for example in the manner of an electric razor.

In principle, however, the electrical machine according to the invention can also be used for high and extremely high outputs will.

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Claims (1)

5 "T3786 INTERELECTRIC SÄCHSELN AG March 18, 1966 SÄCHSELN OV / SWITZERLAND PATENT CLAIMS 1.Electric machine with ironless rotor design, characterized, that the stator (2), which at the same time forms the iron connection part, itself has a flat construction. 2. Electrical machine according to Claim 1, characterized in that the iron back yoke part (2) enclosing the rotor (5) has flattened areas (3, 3 ') at the points (3, 3') opposite _{the magnetic poles (N 1 S) (Fig. La).} 3. Electrical machine according to claim 2, characterized in that the iron back yoke part (2) laaelliert from single sheets is constructed. - Io - 009821/0374 originally inspected Electrical machine according to Claim I _1, characterized in that the iron back yoke part (12 or 13) is U-shaped. 5. Electrical machine according to claim 4, characterized in that the U-shaped iron return part (lk) has a central mandrel (15) (Fig. 3), which itself can also be designed as a magnet. 6. Electrical machine according to one of claims 1 to 5, characterized in that that it has two separate magnet systems (Fig. 4). 7. Electrical machine according to one of claims k to 6, characterized in that two separate Peraanentaagnete (17, 17 ') are arranged on the U-leg (14, 14') of the iron backing part (13) (Fig. 3 and 4) . -I- 009821/0374 -I- β. Electric machine according to one of the claims 1 to 71 characterized in that that the permanent magnets are designed as single crystal magnets known per se. 9 · Electrical machine according to one of claims 1, 2 and 4 to 8, characterized in that that the element of elimination Sintered metal built 1st, Io. Electrical · Masohine according to one of the claims 1 to 8, marked daduroh, that for a better and safer meeting the collector brushes (β, 8 ') independently Have mutually resilient single contact elements of different natural frequencies. 11. Machine according to one of claims 1 to 9, characterized in that it is switched in Glelchstroabetrleb. 009821/0374 12. Electrical · Hatohlne naoh · 1η · π dar claim « 1 bit lo, thereby gakannseleh ~ η · t, thatB · 1 · ala elctroaotor is formed let. 13 «llektrlsoke Maeokl · naek« U · «« ar 1 kit lo, d a d u r o h gakanntaltk- »· T, da · ■! · A« n «rator aatg« kll4 «t lti. BATH 00982 1/0374 A3 Blank page